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Disease Focus

Adult-Onset Autosomal Dominant Leukodystrophy: Linking Nuclear Envelope to Myelin

Shu-Ting Lin, Louis J. Ptáček and Ying-Hui Fu
Journal of Neuroscience 26 January 2011, 31 (4) 1163-1166; DOI: https://doi.org/10.1523/JNEUROSCI.5994-10.2011
Shu-Ting Lin
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Louis J. Ptáček
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Ying-Hui Fu
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Introduction

Adult-onset autosomal dominant leukodystrophy (ADLD) was first described for a large kindred with a progressive and fatal neurological white matter disorder in an American-Irish family (Eldridge et al., 1984). Subsequently, ADLD has been reported in many other ethnic groups including Japanese, Swedish, French, Italian, and French Canadian (Asahara et al., 1996; Marklund et al., 2006; Melberg et al., 2006; Meijer et al., 2008; Brussino et al., 2009, 2010). Clinically, ADLD is a progressive degenerative neurological disorder with pyramidal, cerebellar, and autonomic disturbances (Eldridge et al., 1984; Coffeen et al., 2000; Marklund et al., 2006; Melberg et al., 2006). The symptoms begin between the forth and sixth decades (mean age of ∼40 years) of life with early presentation of autonomic symptoms, including bowel/bladder dysfunction, impotence in males, and orthostatic hypotension (Schwankhaus et al., 1988; Coffeen et al., 2000). Autonomic symptoms precede cerebellar signs (ataxia, dysmetria, nystagmus, and action tremors) and pyramidal abnormalities (spasticity and weakness of both upper and lower extremities). Mild cognitive, visual, and auditory abnormalities are also present in some cases. The peripheral nervous system is spared (Schwankhaus et al., 1994). Upper motor neuron signs such as spastic paralysis, posterior column dysfunction, and extensor plantar responses are also common phenotypic characteristics (Coffeen et al., 2000). In addition to the clinical history and physical examination, magnetic resonance imaging (MRI) is the best method to diagnose ADLD. The MRI scans display diffuse, confluent and symmetric white matter involvement starting in the frontoparietal region, extending to the brainstem and cerebellar white matter (Fig. 1) (Bergui et al., 1997; Coffeen et al., 2000; Melberg et al., 2006). Periventricular white matter appears less affected than the adjacent white matter (Melberg et al., 2006). The diameter of the medulla oblongata is reduced in the coronal plane and the corpus callosum is atrophic (Schwankhaus et al., 1988; Melberg et al., 2006). Although spinal cord involvement has been reported in some cases (Sundblom et al., 2009), white matter changes are most significant in the brain. Neuropathological findings revealed white matter abnormalities in the frontoparietal and cerebellar white matter, whereas the cortex and subcortical U fiber showed no significant pathology in symptomatic ADLD patients (Schwankhaus et al., 1988; Coffeen et al., 2000; Melberg et al., 2006). Light microscopy showed vacuolated white matter with no significant loss of oligodendroglia accompanied by an absence of inflammatory changes and reactive astrocytosis (Coffeen et al., 2000; Melberg et al., 2006). Sparse astrocytes with intense reaction products (insulin-like growth factor-1 and vimentin) are accompanied by abnormally beaded or foreshortened morphology or abnormal thickening processes. Reduced numbers of Purkinje cells and slightly increased numbers of Bergmann cells in cerebellum are also noted (Melberg et al., 2006). Because no significant inflammatory infiltrates, activated microglia, or macrophages are present, this disorder does not appear to result from the direct autoimmune attack on myelin proteins that is present in multiple sclerosis. In addition, neuronal damage or axon loss is absent. Overall, preservation of oligodendroglia in the presence of demyelination and lacking or moderate astrogliosis under light microscopy are the unique features of ADLD (Coffeen et al., 2000; Melberg et al., 2006).

Figure 1.
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Figure 1.

T2 weighted MRI showing characteristic white matter hyperintensities identified in patients with Lamin B1 mutations. These MRI abnormalities appear to be restricted to specific white matter tracts and accumulate through the course of disease. A, Transverse (axial) cross section through mid-pons at level of facial colliculus. Short arrow, Corticospinal and corticobulbar tracts (may include crossing pontine tracts); long arrow, medial lemniscus; double arrow, middle cerebellar peduncle (brachium pontis). B, Transverse (axial) cross section through hemispheres at level of lateral ventricles. Three left side arrows, Superior longitudinal fasciculus; short arrow, cingulum. C, Transverse (axial) cross section through caudal midbrain below level of red nucleus. Short arrow, Crossing fibers of superior cerebellar peduncle (brachium conjunctivum); long arrow, medial lemniscus.

ADLD was found to be caused by duplication of LMNB1 gene encoding lamin B1 (Padiath et al., 2006) (Fig. 2). Lamin B1 is a component of nuclear lamina which is a filamentous meshwork of proteins underlying the inner nuclear membrane. Nuclear lamina has been found to play dynamic roles in the organization and regulation of chromatin, transcription, DNA replication, DNA repair, and various epigenetic phenomena of euchromatin and heterochromatin transitions (Dechat et al., 2010). Mammalian cells have two major types of lamins, A and B types, and mutations in genes encoding the nuclear lamins can cause a wide range of human diseases, collectively called laminopathies (for review, see Worman and Bonne, 2007; Worman et al., 2010). Lamins anchor chromatin to the nuclear lamina and act as a scaffold for chromatin remodeling, and are critical for determining spatial organization of chromosomes in the nucleus (Vlcek and Foisner, 2007). Genomic regions that are tethered to the nuclear periphery were shown to be associated with reduced transcription of genes in the region (Finlan et al., 2008; Reddy et al., 2008). Specifically, lamin B1 was demonstrated to play a role in gene expression and chromosome position using cultured mammalian fibroblast cells lacking lamin B1 (Malhas et al., 2007). In addition, lamina-associated domains of lamin B1 are connected to genome regions with low expression levels, exhibiting lower levels of active chromatin, and enriched with silenced chromatin markers that indicate repressive chromatin organization (Pickersgill et al., 2006; Guelen et al., 2008; Towbin et al., 2009). The high-resolution genome-nuclear lamina interaction maps of lamin B1 in pluripotent embryonic stem cells, multipotent precursor cells, and terminal differentiated cells revealed a dynamic interaction of nuclear lamina and genes in the genome according to cell type, differentiation steps, and gene expression levels correlating with subsequent repression or activation (Peric-Hupkes et al., 2010).

Figure 2.
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Figure 2.

Schematic representation showing genomic structure of the size and extent of duplications in ADLD. Three families are shown according to size and extent of duplication of LMNB1. Arrows indicate the direction of transcription and red boxes indicate the size and extent of duplications.

Overexpression of B-type lamins was shown to promote nuclear membrane growth and intranuclear membrane formation in amphibian oocytes, epithelium, and mammalian kidney cells in a CaaX motif-dependent manner (Prüfert et al., 2004; Ralle et al., 2004). In agreement with these findings, ectopic overexpression of LMNB1 in neural and glial cells increased surface area of nuclear membrane and intranuclear aggregates (Lin and Fu, 2009). Increased expression of lamin B1 results in perturbations of inner nuclear membrane proteins, chromatin organization, and nuclear pore transport. Together, these changes lead to defects in oligodendroglia differentiation (Lin and Fu, 2009). It is possible that lamin B1 overexpression, through formation of abnormal intranuclear membranes, leads to the altered subcellular localization of nuclear envelope proteins and perturbed nuclear transport. In a primary culture system, lentivirus induces moderate overexpression of LMNB1 in oligodendrocytes leading to drastic effects on myelin protein expression and defects of differentiation accompanied by minimal nuclear envelope growth/distortion compared with those found in established culture systems. These results suggest that genes required for myelin proteins and oligodendrocyte maturation are sensitive to changes in nuclear envelope. Indeed, the specific effects of LMNB1 overexpression on gene transcription were confirmed by the repression of myelin-specific genes and the activation of GFAP transcription (Lin and Fu, 2009). These results suggest that overexpression of LMNB1 could disturb the unique gene expression patterns in individual CNS cell types and that phenotypes would only appear in certain cell types that are vulnerable to the transcriptional changes.

LMNB1 duplication is associated with the severe demyelinating phenotype in ADLD. This is the only disease of nuclear lamina linked to myelin (Padiath et al., 2006). Interestingly, duplications of PLP1 are one of the most common causes of demyelination in Pelizaeus-Merzbacher disease (Inoue et al., 1996; Inoue, 2005). Overexpression of the common myelin protein, proteolipid protein (PLP), causes endoplasmic reticulum stress leading to oligodendrocyte demise (Bauer et al., 2002). Increased lamin B1 expression in neurons or glia causes lethality in Drosophila, while overexpression with an eye-specific driver causes a degenerative phenotype (Padiath et al., 2006). Gene trap insertion in mouse resulted in an allele encoding lamin B1 lacking the C terminus, and results in perinatal lethality due to lung and bone abnormalities (Vergnes et al., 2004). These results suggest that developmental processes in invertebrates and vertebrates are highly sensitive to the levels of lamin B1. Interestingly, lamin B1 in brain is developmentally regulated, with levels peaking at birth or postnatal day 1, followed by a gradual decrease from postnatal day 1 to 10 months of age (Lin and Fu, 2009) (Fig. 3), and Lmnb1 mRNA levels are gradually downregulated during oligodendrocyte maturation (Dugas et al., 2006). All these results suggest a possible role for Lamin B1 in the regulation of oligodendrocyte development.

Figure 3.
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Figure 3.

Level of miR-23 expression in the murine brain gradually increases with age in a pattern that is complementary to that of Lmnb1.

MicroRNAs (miRNAs) bind to mRNAs and target them for degradation or interfere with translation. There has been growing appreciation for miRNAs as essential regulators for biological processes, both in health and disease (Bartel, 2004; Stefani and Slack, 2008). miRNAs are initially generated from long hairpin-loop RNA precursors, which are consecutively processed to functional small noncoding RNAs ∼22 nt by the ribonucleases, Drosha and Dicer, in the nucleus and cytoplasm before being assembled into an RNA-induced silencing complex (Bartel, 2004). In the developing CNS, many miRNAs show a distinct expression pattern (Landgraf et al., 2007), supporting the idea that they may play important roles during mammalian brain development, particularly for cell type differentiation in the CNS (Johnston and Hobert, 2003). In addition, expression levels of miRNAs in oligodendroglia are altered according to their differentiation stages, indicating a possible role in switching between migratory, proliferating, and myelinating oligodendrocytes (Lau et al., 2008; Budde et al., 2010; Dugas et al., 2010; Nave, 2010; Zhao et al., 2010). Dicer ablation in oligodendroglia at postdevelopmental stages results in a neurodegenerative phenotype including demyelination, inflammation, and axon loss (Shin et al., 2009), suggesting that miRNAs are also important for myelin maintenance at later developmental stages. In the presence of excess miR-23 in cell cultures, a greater proportion of cells express mature markers of oligodendrocytes that are paralleled by multipolar morphological appearance with increased levels of mature myelin proteins, indicating that miR-23 can enhance oligodendrogenesis. In contrast, excessive lamin B1 leads to lower numbers of cells expressing mature markers with reduced levels of mature myelin proteins, suggesting defective differentiation of oligodendrocytes. Importantly, the adverse effect of lamin B1 on oligodendrocyte cells can be abrogated by miR-23 as a negative regulator of lamin B1 (Lin and Fu, 2009). Interestingly, the developmental expression pattern of miR-23 is reciprocal to that of the lamin B1 (Fig 3). The relevance of these in vitro findings to the in vivo situation is supported by the observation of reduced levels of oligodendrocyte- and myelin-specific proteins at a molecular level in ADLD brain tissues. It is possible that miR-23 can also enhance oligodendrocyte development through other lamin B1-independent pathways. In this case, excessive lamin B1 production in the cells may sequester miR-23 during maturation, thereby further adding to the deteriorating myelin loss from lamin B1 overexpression in the CNS.

Myelin generation and healthy myelin maintenance are complex processes that require delicate orchestration of a large number of factors and pathways. However, our understanding of these processes remains incomplete. The involvement of nuclear lamina and miRNAs in myelin regulation has only recently been discovered. Identification of upstream enhancer/repressor elements that can modulate miRNA expression and additional downstream effectors of lamin B1 and miR-23 may provide new insight into the mechanisms of oligodendrocyte development, myelin formation, and maintenance. A mouse model overexpressing lamin B1 and mimicking the human ADLD condition will be a critical resource for further investigations in vivo. Growing understanding of novel pathways critical for myelin regulation will provide novel targets to screen for molecules/compounds for treatment of disorders of myelin. In vivo and in vitro studies exploring mechanisms that link miRNAs and lamins to oligodendroglia maturation and myelin maintenance will certainly extend our knowledge into molecular mechanisms of glia development and myelin synthesis. Ultimately, such advances will hopefully lead to better treatments for ADLD and other myelin disorders.

Footnotes

  • Editor's Note: Disease Focus articles provide brief overviews of a neural disease or syndrome, emphasizing potential links to basic neural mechanisms. They are presented in the hope of helping researchers identify clinical implications of their research. For more information, see http://www.jneurosci.org/misc/ifa_minireviews.dtl.

  • We thank Dr. Ari Green at University of California, San Francisco for the assistance on the interpretation of MRI images.

  • Correspondence should be addressed to Ying-Hui Fu, Department of Neurology, University of California, San Francisco, 1550 Fourth Street, RH546, UCSF-Mission Bay, San Francisco, CA 94158. ying-hui.fu{at}ucsf.edu

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The Journal of Neuroscience: 31 (4)
Journal of Neuroscience
Vol. 31, Issue 4
26 Jan 2011
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Adult-Onset Autosomal Dominant Leukodystrophy: Linking Nuclear Envelope to Myelin
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Adult-Onset Autosomal Dominant Leukodystrophy: Linking Nuclear Envelope to Myelin
Shu-Ting Lin, Louis J. Ptáček, Ying-Hui Fu
Journal of Neuroscience 26 January 2011, 31 (4) 1163-1166; DOI: 10.1523/JNEUROSCI.5994-10.2011

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Adult-Onset Autosomal Dominant Leukodystrophy: Linking Nuclear Envelope to Myelin
Shu-Ting Lin, Louis J. Ptáček, Ying-Hui Fu
Journal of Neuroscience 26 January 2011, 31 (4) 1163-1166; DOI: 10.1523/JNEUROSCI.5994-10.2011
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